I was playing my usual LoL today and out of nowhere the Vanguard VAN 128 error popped up. How do I fix it?

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I’ve already followed all the steps described on Riot’s official website, which says to run a CMD
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I’ve never downloaded anything suspicious on this PC. I don’t use anything that could give me an advantage either. I’m already good naturally.
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I also followed everything they say in this video and nothing worked:
https://youtu.be/Mgsupj4Yheg?si=6RBoZ8TVmaHbCAkl
Could it be some problem with my internet or was I banned for something I don’t know about?
EDIT: Opening Device Manager and disabling Sonic Studio Virtual Mixer solved it for me